Marking-gage.



A. AQHARVIE.

MARKING GAGE.

APPLICATION FILED JULY 2, 1910.

Patented July 25, 1911.

er 207272 New M 3 /6 [52x/en for:

COLUMBIA PLANOURAPH cm. wAsHxNn'rON, D. c.

renie.

ALBERT A. HARVIE, OF OTTUMWA, IOW'A.

MARKING-GAGE.

Specification of Letters Patent.

Application filed July 2, 19M).

Patented July 25, 19ML. serial No. 570,673.

To all whom it may concern: I

Be it known that l, ALBERT A. lflARvm, a citizen of the United States,residing at Ottumwa, in the county of VVapello and State of lowa, haveinvented certain new and useful lmprovements in Marking-Gages, of whichthe following is a specification.

ln certain woodworking operations it is desirable to be able to mark twoor more parallel lines on a board at a certain distance from its edge,as, for example, when a groove is to be cut in the surface of the boardat a specified distance from the edge. In order to make these marksquickly and space them accurately, it is desirable to have an instrumentwhich will make both of the marks at once. Such an instrument should beprovided with two or more adjustable rods or their equivalent, fixed toa common frame or base in such a manner that the distances between themarking edges of the rods from each other, and also their distance fromthe frame which contacts the edge of the board, may be adjustable. Also,the instrument should be one having the fewest possible number of parts,so that it can be cheaply made and so as to have great strength anddurability. Scales should be provided on the rods in such manner thatthey can be immediately adjusted to any desired position without thenecessity of using any other measuring instrument. Also, these scalesshould be so located on the rods that they may be read with the greatestamount of convenience and accuracy.

Objects of the invention are, to provide a marking gage having two ormore rods ad-` justable with respect to a common frame in such a waythat the distance between the marking edges of the rods and theirdistance from the frame may be adjusted; to provide an instrument inwhich the rods may be all tightened by the same operation; to providescales on the rods in such a way as to enable their adjustment with thegreatest accuracy and facility; to provide a construction such that whendesired it may be used for marking only one line with an accuracy andfacility fully equal to that of the ordinary instrument; and to providea novel and efficient marking edge or member which will mark the boardin such manner that the mark may be seen with the greatest amount offacility and certainty.

@ther objects and uses will appear from a detailed description of theinvention, which consists in the features of construction andcombination of parts hereinafter described and claimed.

In the drawing- Figure l shows a side view of the instrument with itsbody portion in working position against the edge of a board, both ofthe rods being projected with respect to the body portion; Fig. 2 showsa plan view similar to Fig. l, and it shows the form of mark made by thepreferred type of marking edge; Fig. 3 shows a side elevation of theinstrument, looking in the direction opposite to that of Fig. l, therods having their marking edges drawn closely together but both beingdrawn out into working position with respect to the body portion; F ig.4L shows a longitudinal section of the instrument, showing one way ofattaching the marking members to their respective rods and showing themanner in which the thumb-screw serves to lock both rods at the sameoperation; and Fig. 5 shows a cross section of the body portion and rodsshowing also the manner in which the thumbscrew locks both of the rods.

Referring now to the drawings, the instrument comprises a body portion 6and two or more concentric rods or tubes 7 and 8, which may slide backand forth in a hole through the body portion 6. A thumb screw 9 isprovided for locking the rods in any desired position with respect tothe body portion.

lThe body 6 is provided on each end with a fiat contacting surface 10,cut at right angles to the hole which receives the rods, so that whenone of these contacting surfaces is adjusted against the edge ll of aboard l2 the rods will extend over the face of the board at right anglesto its edge. The central portion 13 of the body 6 is preferably undercutin its lower portion lef so that it may be easily grasped by placing thefingers around this central portion between the end plates l5 and 16.

rThe outer tube 7 is provided with a longitudinal slot 17, through whichthe thumb screw may project into a groove 18 on the inner rod. Byreferring to Figs. t and 5 it is evident that tightening the thumb screw9 will lock both the tube and the rod with respect to the body portion,because the rod will be forced against the side of the tube opposite thethumb screw and the tube on that side will be forced against the bodyportion. Fuitherinore7 the provision of a slot in the tube and thegroove in the rod prevents the rotation of either with respect to thebody port-ion. The desirability of this will be apparent when themarkings on the rod and tube are considered.

Ilihe rod and tube are each provided on one end with a marking member19. rThis is preferably in the form of a little wheel having acorrugated edge and so attached to the rod or tube that it may rotatewith respect thereto. When these marking members are drawn across thesurface of the board they will each form a series of little indentations2O thereon, instead of one long, continuous line such as is formed bythe ordinary marking point. This form of marking member is preferable tothe ordinary point for the reason that a light shining down on the boardwill strike the edges of the indentations 2O in such a way that lightsand shadows will be seen in the indentations, no matter from whatdirection they are observed. On the contrary, an ordinary scratch doesnot always show up distinctly, unless it be large or unless the lightstrike it from exactly the right angle. Furthermore, it is easier tomake a mark of the kind herein shown, because the marking members 19will rotate along the surface of the board instead of catching into thegrain and drawing, as would be the case with a point. When it is desiredto make only one mark, the rod 8 may be used, the tube 7 being shovedback tight against the body portion. ln order to permit the markingmember on the tube to sit up squarely in such manner as not to break thecontinuity of the surface 10, l provide a recess 21 in which the member19 may seat. rThe mark ings on the rod and tube should preferably be solocated that they will be seen when looking down on the top of theinstrument. To this end they should be located approximately 900 aroundthe tube and rod from the slot and groove respectively. Furthermore,inasmuch as the distances to be measured by these markings are thedistances from the member 19 on the tube to the surface 19 on the bodyportion, and between the two members 19 respectively, these markingsshould start at the members 19 and move toward the other end of the tubeand rod. Evidently, also, it is unnecessary to graduate them at theiropposite ends for a distance equal to that which will be covered by thebody portion when they are withdrawn to the maximum amount.

At times it is desirable to use a marking point of the kind ordinarilyin use. To this end 1 provide such a point 22 in the end 23 of the tube,and then graduate the side of the tube opposite to that containing theslot, commencing said graduations with the point 22 and extending themtoward the members 19. 1n order to enable both of t-he members 19 to bedrawn close together, the rod 8 should be short enough so that it willnot strike the marking point when the rod is completely inserted withinthe tube. The preferred manner of attaching this point is to provideholes 24; in the upper and lower surfaces ofthe tube and then to splitthe end of the tube through these holes, as at 25, a slight distance sothat when the point 22 is driven down through the holes 24 the rod maybe expanded a slight amount and thus firmly grip the point and hold itsolidly thereafter.

I claim:

In a marking gagev the combination of a body portion having a pair ofoppositely disposed substantially parallel contact faces, and providedwith a transverse hole at substantially right angles thereto, a tubulargaging member entered into the hole of the body portion, and providedwith a longitudinal slot, and provided on one end with a gaging wheeland on the other end with a transverse marking pin, a gaging rod enteredinto the hole of the tube and provided with a longitudinal groove, andprovided at one end with a gaging wheel, and being of a length such thatit may be completely inserted intol the tube to bring its gaging wheelinto contact with that of the tube, a lock screw threaded into the bodyportion and passed through the slot of the tube and engaging the grooveof the rod to lock the tube and rod in fixed position with respect tothe body, and whereby the tube and rod are held from rotation withrespect to the body when the thumb screw is loosened to permitlongitudinal movement of the tube and rod, gaging markings on 'the tubecommencing at the gaging wheel end thereof, gaging markings on the rodcommencing at the gaging wheel end thereof and located on substantiallythe same side thereof as the markings on the tube when the rod and tubeare held against rotation by the thumb screw, and a series of gagingmarkings on the tube commencing at the gaging pin end. thereof andlangularly displaced from the iirst mentioned set of, gaging markings ofthe tube to prevent confusion between the two sets of markings on thetube, substantially as described.

ALBERT A. HARVIE. 1lWitnesses S. L. VEST, P. C. AGKLEY.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

